半胱氨酸改性Fe_3O_4纳米材料对Pb(Ⅱ)的吸附研究
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摘要
为了解决水体中Pb(Ⅱ)污染问题,利用SiO_2和半胱氨酸(Cys)对Fe_3O_4纳米粒子进行表面修饰,并用于水中Pb(Ⅱ)的去除研究。实验结果表明,Fe_3O_4@SiO_2@Cys的吸附效果明显优于另外两种未修饰Cys的磁性纳米材料(Fe_3O_4和Fe_3O_4@SiO_2)。当Fe_3O_4@SiO_2@Cys投加量为1.0g/L,pH=6.0,Pb(Ⅱ)初始质量浓度为100mg/L,吸附时间为30min时,水中Pb(Ⅱ)去除率可达到95%以上。在Cd(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)共存条件下,Fe_3O_4@SiO_2@Cys对Pb(Ⅱ)的吸附效果明显优于其他3种金属离子。经5次循环使用后,Fe_3O_4@SiO_2@Cys对Pb(Ⅱ)的去除率仍保持在80%左右。
In order to solve the problem of Pb(Ⅱ)pollution,SiO_2 and L-cysteine(Cys)were applied to modify the Fe_3O_4.The composites were applied to removing Pb(Ⅱ)in water.Adsorption results demonstrated that the Fe_3O_4@SiO_2@Cys showed better adsorption capacity than Fe_3O_4 and Fe_3O_4@SiO_2.The removing rate of Pb(Ⅱ)from water was more than 95% when the adsorbent dosage was 1.0 g/L,pH 6.0,Pb(Ⅱ)initial mass concentration100 mg/L,and adsorbing time 30 min.In addition,compared with Cu(Ⅱ),Cd(Ⅱ)and Zn(Ⅱ),the adsorbent showed better adsorption capacity for Pb(Ⅱ).The desorption and regeneration studies showed that the adsorption efficiency of Fe_3O_4@SiO_2@Cys remained at 80% after 5 cycles.
In order to solve the problem of Pb(Ⅱ)pollution,SiO_2 and L-cysteine(Cys)were applied to modify the Fe_3O_4.The composites were applied to removing Pb(Ⅱ)in water.Adsorption results demonstrated that the Fe_3O_4@SiO_2@Cys showed better adsorption capacity than Fe_3O_4 and Fe_3O_4@SiO_2.The removing rate of Pb(Ⅱ)from water was more than 95% when the adsorbent dosage was 1.0 g/L,pH 6.0,Pb(Ⅱ)initial mass concentration100 mg/L,and adsorbing time 30 min.In addition,compared with Cu(Ⅱ),Cd(Ⅱ)and Zn(Ⅱ),the adsorbent showed better adsorption capacity for Pb(Ⅱ).The desorption and regeneration studies showed that the adsorption efficiency of Fe_3O_4@SiO_2@Cys remained at 80% after 5 cycles.
引文
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[3]MARTIN F S,FEDERIC P,GENINE S,et al.Lead pollution insubtropical ecosystems on the SE Gulf of California Coast:a study of concentrations and isotopic composition[J].Marine Environmental Research,2008,66(4):451-458.
[4]张晓青,寇希元,张爱君,等.酿酒酵母吸附海水中铅离子的研究[J].化学与生物工程,2015,32(10):29-33.
[5]朱丽英,晏晓琴,凌敏洁,等.磁性微球固定化啤酒废酵母吸附重金属铅[J].化学与生物工程,2015,32(7):18-21.
[6]KAN Y J,YUE Q Y,KONG J J,et al.The application of activated carbon produced from waste printed circuit boards(PCBs)by H3PO4and steam activation for the removal of malachite green[J].Chemical Engineering Journal,2015,260:541-549.
[7]YANG Y,WEI Z,ZAHNG X.et al.Biochar fromAlternanthera philoxeroides could remove Pb(Ⅱ)efficiently[J].Bioresource Technology,2014,171:227-232.
[8]XU P,ZENG G M,HUANG D L,et al.Adsorption of Pb(Ⅱ)by iron oxide nanoparticles immobilized Phanerochaete chrysosporium:equilibrium,kinetic,thermodynamic and mechanisms analysis[J].Chemical Engineering Journal,2012,203:423-431.
[9]张玲.四氧化三铁纳米颗粒及其复合物的制备和研究[D].上海:上海交通大学,2007.
[10]ZHAO G,FENG J J,ZHANG Q L,et al.Synthesis and characterization of Prussian Blue modified magnetite nanoparticles and its application to the electrocatalytic reduction of H2O2[J].Chemistry of Materials,2005,17(12):3154-3159.
[11]骆华锋.二氧化硅包覆磁性纳米粒子的制备与表征[J].青岛科技大学学报(自然科学版),2012,33(3):225-228.
[12]郭唐华,陈圣岳,彭懋.氨基化二氧化硅包覆碳纳米管增强环氧树脂复合材料[J].材料科学与工程学报,2014,32(4):475-479,504.
[13]VANDENBOSSCHE M,CASETTA M,JIMENEZ M,et al.Cysteine-grafted nonwoven geotextile:a new and efficient material for heavy metals sorption-Part A[J].Journal of Environmental Management,2014,132:107-112.
[14]庞婷雯,杨志军,黄逸聪,等.巯基化、钠化和酸化膨润土对Cu2+,Pb2+和Zn2+的吸附性能研究[J].光谱学与光谱分析,2018,38(4):1203-1208.
[15]IDRIS S A,HARVEY S R,GIBSON L T.Selective extraction of mercury(Ⅱ)from water samples using mercapto functionalised-MCM-41and regeneration of the sorbent using microwave digestion[J].Journal of Hazardous Materials,2011,193:171-176.
[16]NAIYA T K,BHATTACHARYA A K,DAS S K.Adsorption of Pb(Ⅱ)by sawdust and neem bark from aqueous solutions[J].Environmental Progress,2008,27(3):313-328.
[17]YAP M W,MUBARAK N M,SAHU J N,et al.Microwave induced synthesis of magnetic biochar from agricultural biomass for removal of lead and cadmium from wastewater[J].Journal of Industrial and Engineering Chemistry,2017,45:287-295.
[18]PAUL S,BERA D,CHATTOPADHYAY P,et al.Bioaccumulation of Pb(Ⅱ)by Bacilus cereus M16immobilized in calcium alginate gel[J].Journal of Hazardous Substance Research,2005,5:1-13.
[19]ERDEM M,GUR F,TUMEN F.Cr(Ⅵ)reduction in aqueous solutions by siderite[J].Journal of Hazardous Materials,2004,113(1/2/3):217-222.
[20]CUI X Q,FANG S Y,YAO Y Q,et al.Potential mechanisms of cadmium removal from aqueous solution by Canna indica derived biochar[J].Science of the Total Environment,2016,562:517-525.